JPS6238273Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is implemented in a single-phase three-wire distribution board 21 as shown in FIG. This relates to the structure of the neutral switch 24 used during inspection.

Normally, the opening/closing mechanism of a neutral switch has a very simple structure because it is not used all the time, and as shown in the conventional example in FIG. 4, the operating handle 7 does not have a return spring. Further, when the contact is opened, the operating handle protrudes to the top surface of the device body 1, and there is a risk that it may easily be turned over if the hem of clothing gets caught or vibration is applied during operation. The present invention aims to solve the above problems.

The present invention will be described in detail below with reference to embodiment drawings. In FIGS. 1 and 2, a movable contact is attached to both terminal plates 2 and 3 fixedly installed on the upper surface of the container body 1 by means of a compression spring 4 from the lower surface. 5 in elastic contact, and the vessel body 1
The movable contact can be opened and closed by an eccentric cam portion 8 of an operating handle 7 that is pivotally supported in an upper surface opening 6,
A terminal screw 9 is screwed into the end of one terminal plate 2, and the other terminal plate 3 is bent into a U-shape along the wall surface of the container and exposed through the opening 10 on the lower surface of the container. In the neutral switch connected to the sexual intercourse bar 11, a fitting projection 12 is fitted to one of the opposing positions of the operating handle 7 and the device body 1, and the fitting projection 12 is press-fitted to the other. A mating recess 13 is provided to hold the operating handle 7 when the switch is in the open or closed state. The neutral phase bar 11 and the input side terminal board 3 may be connected by a connecting screw 14 as in the conventional example shown in FIG. Engagement recesses 15 and 16 are provided on both end faces of the container body 1 so that the switch can be attached from the front side, and a common engagement protrusion 17 is provided on one side, and multiple independent engagement protrusions are provided on the other side. Fastener 19 with protrusion 18
The neutral phase bar 11 is held under clamping pressure.

The present invention is constructed as described above, and by providing a fitting protrusion and a fitting recess on the operating handle and the device body and press-fitting them, the handle is prevented from eccentricity due to vibration or shock when the switch is open. There is no risk that the cam part and the movable contact will disengage and cause the operator to lose electricity, and when the switch is closed, the handle will not rattle or get caught on the operator's hem even if there is no return spring. This has the advantage that there is no risk of the contacts opening accidentally, and a neutral switch that is safe and easy to operate can be provided with an extremely simple structure.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, in which a is a longitudinal sectional view, b is a perspective view of the main parts of the same, Fig. 2 is an exploded perspective view of the main parts of the same, and Fig. 3 is the state of use of the same. FIG. 4 is a front view of a distribution board showing a conventional example. 1 is the container body, 2 and 3 are the terminal plates, 4 is the compression spring, and 5
1 is a movable contact, 6 is an upper surface opening, 7 is an operating handle, 8 is an eccentric cam portion, 9 is a terminal screw, 10 is a lower opening, 11 is a neutral phase bar, 12 is a fitting protrusion, 1
3 is a fitting recess.

Claims (1)

[Scope of utility model registration request] The movable contact is brought into elastic contact with both terminal plates fixed on the upper surface of the container from the lower surface by a compression spring, and the movable contact is brought into contact with the eccentric cam portion of the operation handle that is pivotally supported in the upper opening of the container. It can be opened and closed freely, and a terminal screw is screwed into the end of one terminal plate, and the other terminal plate is bent into a U-shape along the wall of the container and exposed through the opening on the bottom of the container. In a neutral switch connected to a neutral phase bar, a fitting protrusion is provided at one of the opposing positions of the operating handle and the device body, and a fitting recess into which the fitting protrusion is press-fitted is provided on the other side. A neutral switch for a single-phase three-wire distribution board, which is equipped with a switch and an operating handle that is held in the open or closed state.